Elevator-hatchway door lock



Oct. 7. 1924. 1 1,510,878

W. J. WIGMORE ELEVATOR HATcHWA: DOOR LOCK Filed July 16. 1923 WITNESSES: 2

Patented Oct. 7, 192 2.

rice,

WILLIAM J. \WIGMORE, OF OAKLAND, CALIFORNIA.

ELEVATOR-HATCHWAY DOOR LOCK.

Application filed July 16, 1923. vSerial No. 651,839.

- of Alameda and State of California, have inembodiment of my invention,such as will enable others skilled. in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, which forms a part of this specification.

My present invention pertains to novel electro-mechanical mechanism for elevator hatchway door-locks, and particularly to door-locks adapted for use on full automatic elevators.

This invention has for its object primarily to provide an elevator door-lock, wherein the hatchway door cannot be opened when the elevator car is in motion.

A still further object of this invention is to provide an elevator hatchway door-lock of the aforesaid description, that will be simple in construction, positive in operation and not liable to disarrangement of the elements thereof, when same is subject to constant operation.

Other objects of this invention will appear more fully hereinafter, the novel combination of elements being designated in the claim appended hereto.

With these ends in view, my invention consists substantially in the details of construction, combination, location, and arrangement of elements hereinafter set forth. Its characteristic advantages and the merits thereof will be described in detail, referring by numerals and letters as reference-marks to the accompanying drawings forming a part of this specification, and wherein, similar numerals and letters of reference designate corresponding parts in all figures.

A preferred embodiment of my invention is illustrated in the accompanying sheet of drawings; wherein Fig. 1 is a front elevation of the lock in its locked position, showing the several elements thereof. Fig. 2 is a similar view of the lock as shown in Fig. 1, showing the same in an unlocked position. Fig. 3 is a schematical view of an elevator-car with a cam attached thereto in contact with a certain element of the lock shown in Figs. 1 and 2.

Referring to the several drawings and the reference signs appearing thereon, the numeral 1 designates a keeper-casing containing the mechanism of the lock while 6 designates the keeper-casing of the latch 4;

Within keeper-casing 1 isshown a set of electrical terminals 10 and 11 supported'by an insulating block 12.-v A bridgingpiece 7 13 is attached andcarried by a weighted arm 2, said weighted arm 2 being journaledf by a pin 14. A detent 3 attached to rock-shaft 15 is actuated by lever-arm 9. A roller 8. is attached together with a weight 17 to lever arm 9. An elevator-caris indicated as 19 with a cam 20 attached theretocand carried by same, which actuates lever-arm 9 by said cam coming into contact with roller 8. a a

In carrying out my invention I preferably employ the lock mortised in the jamb of the hatchway door and, the latch carried by the door. In the keeper-casing 1 of the lock, I employ a. weighted arm 2 journaled by a pin 14: the same carrying a bridging piece 13 attached thereto for bridging electrical terminals 10 and 11. The

latch a is pivoted at the pin 7 and drops by gravity when in its normal unlocked. position as shown in Fig. 2. The bridging of the electrical terminals 10 and 11 is affected by the movement of the latch 4 which comes in contact with weighted arm 2' actuating same when said latch is actuated by movable detent 3; the detent 3 is actuated by a cam 20 carried by the elevator car 19 through rock-shaft 15 and lever-arm 9. The cam 20 for actuating this lock is of the retiring type now commonly in use on many makes of elevators, the same on starting of an elevator first retires to the dotted line as shown in Fig. 3, which allows the roller 8 to drop back effecting the locking of latch 4. Then the elevator car stops the cam 20 projects as shown in Fig. 3 unlocking the lock by forcing the roller 8 outward.

The operation of this device is then. as

follows In starting an elevator-car equipped with this lock, the cam 20 is first retired comes in contact With Weighted arm 2, lift ing same and bridging terminals 10 and 11. locked before contact ismade between bridging piece 13 and contacts 10 and 11 and that the latch 4 must be in the look before contact can be made as detent 3 does not come in contact with Weighted arm 2. The detent 3 does not at any time come in direct contact with arm 2, but operates through a slot in same as shown by the dotted lines in the drawing; it is evident then that if the latch 4 was not Within the lock the arm 2 Would not be actuated by the detent 3. When the car stops the cam 20 drops out, striking roller 8 which lowers detent 3 and allows Weighted arm 2 and latch 4 to drop down by gravity, breaking circuit of contacts 10 and 11 and unlocking the lock.

While I have illustrated and described the preferred construction and arrangement of the various parts, it Will be obvious from the foregoing description that the device is susceptible of considerable modification, ithout departing from the essential features or sacrificing any of the advantages thereof, as come Within the scope of the claim appended hereto.

It is obvious that the latch 4 is first" Having noW set forth the object and motive. of my invention and various constructions and arrangements embodying the principles and several features thereof, What I claim as new and useful and of my own invention, is

In an elevator door-lock, the combination of a keeper-casing containing a plurality of electrical terminals, a Weighted lever-arm pivotally attached to said keeper-casing and carrying a bridging piece for bridging said electrical terminals, a movable latch adapted to enter said keeper-casing and actuate said lever-arm for bridging said electrical terminals, a movable vdetent pivotally attached to said keeper-casing for actuating said latch, and a means for actuating said detent.

In testimony whereof, that I claim the foregoing as my own, I have hereunto affixed my signature to this specification in the presence of two subscribing Witnesses this 20th day of June, A. D. 1923.

WILLIAM J'. WIGMORE.

Witnesses:

T. G. CORBETT, R. L. ONEILL. 

